This article mainly introduces the Marshal object serialization in Python knowledge, is the Python Advanced Learning serialization related knowledge, need friends can refer to the
Sometimes, one object in memory is persisted to disk, or serialized into a binary stream sent over the network to a remote host. There are many modules in Python that provide serialization and deserialization capabilities, such as Marsh
This article describes the Python use of Marshal module serialization method, share for everyone to reference. The specific methods are as follows:
Let's take a look at the following code:
Import marshal
data1 = [' abc ', 12,23, ' jb51 '] #几个测试数据
data2 = {1: ' aaa ', ' B ': ' Dad '}
data3 = (1,2,4)
output_file = open ("A.txt", "WB") #把这些数据序列化到文件中, note: file must be opened in binary mode
marshal.
Document directory
Marshal. Dump (value, file [, Version])
Marshal. Load (file)
Marshal. dumps (value [, Version)
Marsahl. Load (string)
Sometimes, you need to save an object in the memory to the disk persistently, or serialize the object to a binary stream over the network and send it to a remote host. Many modules in Python provide serialization and des
Sometimes, an object in memory is persisted to disk, or serialized into a binary stream that is sent over the network to the remote host. There are many modules in Python that provide functionality for serialization and deserialization, such as: Marshal, Pickle, cpickle, and so on. Talk about the Marshal module today.
Note: Marshal is not a generic module,
Finally, I went back to Shanghai from Beijing. I heard about the new features of unity 5 at the Unity Developer Conference for the first time. In fact, I still need to find new functions on my own, it is mainly to add a new GUI system. It seems that NGUI is integrated into Unity, named UGUI, and new sound system and new animation system are integrated, I feel that the new sound system is still quite powerful and I look forward to the advent of unity5. Some common plug-ins and the use of Test Too
This article mainly introduces how to use the marshal module serialization in python, which is a very practical technique. if you need it, refer to the following example to describe how to use the marshal module serialization in python, share it with you for your reference. The specific method is as follows:
Let's take a look at the following code:
Import into aldata1 = ['ABC', 'jb51 '] # test data data2
The activation of a remote object
There are three modes of activation in remoting, and the general implementation is done through static methods of the RemotingServices class. The work process is actually registering the remote object in the channel. Because remoting does not provide a corresponding unregister method to unregister remote objects, Microsoft recommends using marshal (generally translated to group) and disconnect pairing if you need to
different schema types . Could, of course, add xsd:element definitions for all of them to the top level xsd:s Chema element, but the is cumbersome. A generic solution is presented below. the method wraps an arbitrary element of some type T into a wrap (string ns, string tag, T o) {QName Qtag = new QName (ns, tag); Class O.getclass (); @SuppressWarnings ( "Unchecked" ) jaxbelement new Jaxbelement (Qtag, Clazz, O); return Jbe;} To use it, you must create a context capable of
? What does this mean? Masaka .... I suddenly thought that a member in the session is a remote proxy .. Is that true ?? I immediately realized how stupid simple serialization is. What should objref do if marshalbyrefobject is so easy to serialize. So. Similarly, when saving the session, the remote proxy marshal is serialized as objref... OK. Note that during serialization, objref records the object type as the actual type in the file, so unmarshal is
If you are interested in this article, you may have encountered the following similar exception hints in programming:
1, the thread operation is invalid: it is accessed from a thread that is not creating the control "X". (x is the name of the control)
2, "the operation performed on the control is being invoked from the wrong thread." Use Control.Invoke or Control.BeginInvoke to marshal to the correct thread to perform this operation. "
Seeing this
The examples in this paper describe how Python uses the Marshal module serialization method and share it for everyone's reference. Here's how:
Let's take a look at the following code:
Import marshaldata1 = [' abc ', 12,23, ' jb51 '] #几个测试数据data2 = {1: ' aaa ', ' B ': ' Dad '}data3 = (1,2,4) output_file = Open (" A.txt ", ' WB ') #把这些数据序列化到文件中, note: The file must be opened in binary mode Marshal.dump (data1,output_file) marshal.dump (data2,output_fi
Marshal class Namespace: System.Runtime.InteropServices provides a set of methods for allocating unmanaged memory, copying unmanaged memory blocks, converting managed types to unmanaged types, Other miscellaneous methods that are used when interacting with unmanaged code are also provided. Defined in the Marshal class.Staticmethod is critical for handling unmanaged code. Most of the methods defined in this
Marshal. Copy cannot copy data from the offset of the unmanaged pointer. You need to recalculate the value of the unmanaged pointer.
////// Read data////// Data/// Start address/// Number///Public int read (ref byte [] bytdata, int lngaddr, int lngsize){
If (lngaddr + lngsize> m_memsize) return 2; // exceeds the data ZoneIf (m_binit){Int ptrvalue = (INT) m_pwdata; // marshal. Copy cannot copy data from t
#-*-coding:utf-8-*-#python#Xiaodeng#Python Module Marshal (serialization)#from: MldxsImportmarshaldata1= ['ABC', 12, 23,'jb51']data2= {1:'AAA',"b":'dad'}data3= (1,2,4) Output_file= Open ("a.txt",'WB')#serialize the data to a file, note: The file must be opened in binary modemarshal.dump (data1,output_file) marshal.dump (data2,output_file) marshal.dump (data3,output_file) output_ File.close () Input_file= Open ('a.txt','RB')#reading serialized data fro
. Net's garbage collection mechanism is not responsible for the collection of COM objects. Therefore, to manually recycle COM objects, you can use releasecomobject and finalreleasecomobject of the marshal object provided by. Net to solve this problem.
Among them, releasecomobject
Decrements the reference count of the supplied runtime callable wrapper.
Finalreleasecomobject:
Releases all references to a runtime callable wrapper (RCW) by setting the
Use of the marshal. COPY method in C #
The marshal. Copy () method is used to copy content between hosted objects (arrays) and non-hosted objects (intptr ).
There are many overload functions, as shown below:
Copy (array
Copy (array
Copy (array
Copy (array
Copy (array
Copy (array
Copy (intptr, array
Copy (intptr, array
Copy (intptr, array
Copy (intptr, array
Copy (intptr, array
Copy (intptr, array
Some time ago, when C # was used to call a DLL, a callback function was defined in C ++ as follows:
Register the callback function registerstreamdirectreadcallback.Dllexport_api int _ stdcall registerstreamdirectreadcallback (stream_direct_read_callback streamdirectreadcallback, void * context );
The callback function is defined as follows:Typedef int (* stream_direct_read_callback) (ulong channelnumber, void * databuf, DWORD length, int frametype, void * context );
You need to implement t
Func Test_json () {x, _: = json. Marshal ([]string{"aaa:123", "bbb:456"}) fmt. PRINTLN (x) var caps []stringjson. Unmarshal (x, caps) fmt. Println (Caps)}//output Results-------------------------------[the "the" "The" "The" "The" "The" "The" "the" 98 98 98 bbb:456]//each character is converted to the corresponding Ascill valueA specific encoder is found by reflection, and this example corresponds to the encoder stringfunc (e*encodestate) string (sstri
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